Data/hora: 03/06/2024 10:52:10

Biblioteca(s): 	Embrapa Agrobiologia; Embrapa Soja.	
Data corrente: 	26/10/1992	
Data da última atualização: 	26/10/1992	
Autoria: 	WIERSMA, J. V.; ORF, J. H.	
Afiliação: 	Univ. of Minnesota, Northwest Exp. Stn., Crookston, MN 56716.	
Título: 	Early maturing soybean nodulation and performance with selected Bradyrhizobium japonicum strains.	
Ano de publicação: 	1992	
Fonte/Imprenta: 	Agronomy Journal, v.84, n.3, p.449-458, 1992.	
Idioma: 	Inglês
Português	
Conteúdo: 	Seed inoculation with Bradyrhizobium japonicum (Kirchner) Jordan is a common production practice for most soybean [Glycine max (L.) Merr.] growers in northwest Minnesota; however, plants seldom are well-nodulated. Our objectives were to (i) identify strains of B. japonicum that enhance nodulation and agronomic performance of Maturity Group 00 soybean cultivars grown on soils having a range of NO3 - -N concentrations; and (ii) asses cultivar-by-strain specificity. Six cultivars and five B. Japonicum strains were evaluated in six field trials during 1988 to 1990. Nonfertilized (1988-1990) and N fertilized (1990), uninoculated controls were included. Soil NO3 - -N concentrations (0-60 cm) at planting ranged from 52 to 175 kg N ha -1. Residual soil NO3 - -N values were low and substantially less than initial values in only three environments. Nonetheless, significant increases in response to inoculation were observed for grain yield, seed weight, and grain N concentration in 17 of 18 comparisons. In 1990 trials, fertilizer N (168 kg ha -1) increased seed weight and grain N concentration significantly more than inoculation. Nodule number (r = -0.89; significant at P = 0.05) and dry weight (r = -0.97; significant at P = 0.01) were inversely correlated with soil NO3 - -N (0-60 cm) at planting. Estimated (difference method) N2 fixation (r = -0.93; significant at P = 0.05) and relative increases in grain yield (r = -0.93; significant st P = 0.05), seed weight (r = -0.97; significant at P = 0.01) and grain N concentration (r	
Palavras-Chave: 	RIZOBIO; SELECAO DE ESTIRPE.	
Thesagro: 	Bactéria; Bradyrhizobium Japonicum; Leguminosa; Nitrato; Nitrogênio; Nodulação; Nódulo; Simbiose; Soja.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (14387-1) - ADD - SP - -- - 9817 -  - 9817 - DIS
CNPAB - (20559-1) - ADC - SP - -- -  -  - 18419 - DIS